Error Serializing a Wrapped SortedList

[Phil Galey]

I'm using VB.NET 2002 on Windows 2000 Pro and am having trouble serializing a SortedList.

This is my class:
<Serializable()Public Class clsGoodFiles
Inherits SortedList
Public Sub New()
MyBase.New()
End Sub
End Class

This is my calling code:

Dim xw As New Xml.XmlTextWriter(Path.Combine(Application.Startup Path, "GoodFiles.xml"), System.Text.Encoding.UTF8)
Dim xs As New Xml.Serialization.XmlSerializer(GetType(clsGoodFil es)) <=== ERROR LINE
Dim obj As New clsGoodFiles()
obj.Add("ABC.TIF", "A")
xs.Serialize(xw, obj)
xw.Close()
xw = Nothing
xs = Nothing
GC.Collect()

When it gets to the line indicated as ERROR LINE, it generates the following error:

An unhandled exception of type 'System.InvalidOperationException' occurred in system.xml.dll
Additional information: There was an error reflecting 'WindowsApplication22.clsGoodFiles'.

This same technique works fine if I inherit an ArrayList. But ArrayList and SortedList both show Serializable in the documentation. Is there a way to get the serialization of the SortedList to work? Thanks.

Phil

[Martin Honnen]

Phil Galey wrote:

This same technique works fine if I inherit an ArrayList. But ArrayList
and SortedList both show Serializable in the documentation. Is there a
way to get the serialization of the SortedList to work?

I don't think so, when I try your code with VS 2003 then I get a more
specific error message:

Unhandled Exception: System.NotSupportedException: The type
ConsoleApplication35
..Module1+clsGoodFiles is not supported because it implements IDictionary.

So _XML serialization_ of that type is not supported. ArrayList does not
implement the interface IDictionary so it is different. And the
Serializable attribute refers to binary serialization, not XML
serialization.

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Phil Galey]

Ok thanks, Martin.

Phil

"Martin Honnen" <ma*******@yahoo.dewrote in message
news:u9**************@TK2MSFTNGP02.phx.gbl...

Phil Galey wrote:

This same technique works fine if I inherit an ArrayList. But ArrayList
and SortedList both show Serializable in the documentation. Is there a
way to get the serialization of the SortedList to work?

I don't think so, when I try your code with VS 2003 then I get a more
specific error message:

Unhandled Exception: System.NotSupportedException: The type
ConsoleApplication35
.Module1+clsGoodFiles is not supported because it implements IDictionary.

So _XML serialization_ of that type is not supported. ArrayList does not
implement the interface IDictionary so it is different. And the
Serializable attribute refers to binary serialization, not XML
serialization.

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/